The plasma cutting machine is a new kind of thermal cutting equipment. It works with oxygen or acetylene compressed gas as the working gas, with high temperature and high speed flame (or plasma arc) as a heat source, the metal will be cut by the local melting, and at the same time with high-speed air flow will melt the metal blowing Walking, forming a narrow slit. The device not only cutting speed, narrow slits, incision formation, heat affected zone is small, the workpiece deformation is low, simple operation, and has significant energy saving, feed effect.